John Kassir (b. October 24, 1957) portrayed Atom in the 1997 live action Justice League of America pilot and voiced the Joker for the Joker's Playhouse animated short.
- Pictured: John Kassir as Atom from the Justice League of America pilot
Work History
Acting Credits
| Justice League of America | December 28, 1997 | Atom |
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| Joker's Playhouse | 2010 | Joker |
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| Batman: Arkham Origins | October 25, 2013 | Joker Thugs Criminals Mobsters |
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